斜劈式翼型扰流柱冷却通道流动与换热数值研究

基于NACA翼型和斜劈式纵向涡发生器结构设计了一种新型斜劈式翼型扰流柱及其在冷却通道内的排布形式,采用数值模拟方法对含有该种翼型扰流柱的涡轮叶片冷却通道流动换热特性进行了研究,得到了流场和温度场的详细特征及含有斜劈式翼型扰流柱冷却通道的换热能力。分析结果表明:斜劈式翼型扰流柱有良好的强化换热效果。该翼型扰流柱的斜劈式结构可以在其尾缘后方形成持久而稳定的二次流纵向涡,有助于加强流场的扰动作用,从而增强通道换热能力。 

Numerical investigation on flow and heat transfer of beveled pin-fins based on airfoil profile in a cooling channel

Based on NACA airfoil profile and the structure of beveled vortice generator, a novel beveled design of NACA pin-fin and its configuration in the cooling channel of turbine blade were proposed. Numerical simulation was conducted to investigate the flow and heat transfer characteristics of this pin-fin arrays in the cooling channel. The detailed physical field distributions of the flow and heat transfer were discussed and the overall thermal performance was also explored. The result indicated that the bevel cut of the pin-fin can produce lasting and stable longitudinal vortices to strengthen the disturbance of flow field, yielding a good effect on enhancing heat transfer of the cooling channel.